Stop mechanism.



F. J. NASH.

STOP MECHANISM.

APPLICATION FILED JULY 11,1906

Patented Apr. 14, 1914.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

FREDERICK NASH, 0F SOMERVILLE, MASSACHUSETTS, ASSIGNOR T0 UNITED SHOE MACHINERY COMPANY, OF PATEZRSON', NEW JERSEY, A CORPORATION OF NEW JERSEY.

STOP MECHANISM.

Specification of Letters Patent,

Patented Apr. 14, 1914.

T 0 all whom it may concern:

Be it known that I, FREDERICK J. Nas:&, a citizen of the United States, residing at Somerville, in the county of'Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Stop Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present mechanism relates to improvements in stop mechanism.

The object of the invention is to improve the construction and operation of stop mech-. anism'; more particularly of stop mechanism of the type which, when applied to a sole rounding machine, is adapted to allow the table of the machine to continue to rotate for a short distance, owing to the momentum of the various operating parts of the machine, after it has made a complete rotation and has been disconnected from the source of power, and to then return the table to its normal starting point. In this aspect the invention is an improvement. upon the stop mechanism disclosed in the pending application of Benjamin F. Mayo, filed November 7, 1902, Serial No. 130,385, to which reference is made by permission, the object of the invention being to improve the operation of the mechanism disclosed in said application by the introduction of checking devices to prevent jar and cause the mechanism to operate gradually andeasily.

Other objects of the invention will be noted in connection with the description of the illustrated embodiment.

'A stop mechanism embodying a preferred form of-the invention is illustrated in the accompanying drawings as applied to a sole rounding machine ofa type well known in the art. r

In. the drawings Figure 1 is a plan view of the stop mechanism; Fig. 2 is a verticalsection of the same; Fig. 3 is a sectional detail view showing the operating lever and connected mechanism; Fig. 4 is a detail view of the driving pinion and its friction disk; i 5 is a detail view of the pinion driver and its friction disk; Fig. 6 is a detail view of the air-check connected with the operating lever; and Fig. 7 is a detail sectional view of the same showing the adjustable air vent.

The table 1 of the soleroundingmachine to which the stop mechanism is applied, is driven by a dr ving shaft 2 rotated by a pulley 3 connected with asuitable source of I I ing with a pinion 5 which is loosely mounted on the inner end of the shaft 2. The bevel gear 5 is connected with the driving shaft so as to transmit. a movement of the latter to the table, the connection being such that the gear is allowed to rotate through a part of a 18V0l 1 1l'.iQ 11 after the driving shaft is brought to rest, and. is then returned to its normal position. with relation to the shaft. This operation is for a purpose well understood in connection with solerounding machines, and is accomplished in the present device by means similar to those disclosed in the application above referred to, the bevel pinion 5 being loosely mounted upon the shaft and connected therewith by means of a driver 6 fixed to the shaft and provided with a projection 7 which engages a corresponding lug 8 on the pinion. A spring 9 connects the driver 6 and the pinion, and tends normally to hold the lug 8 andthe projection 7 in contact, and during the rotation of the table b shaft, the pinion and the ta 1e are driven positively by such engagement. When the shaft is stopped, however, the pinion continues to turn througha art of'a rotation, the lug 8 being disconnec ed from the pro,- jection 7, and it is then returned again by the spring 9, The projection 7 is provided with a mechanism 10 to prevent jar between the lug andthe projection, and in the pres,-

the driving out invention the operationofthis part of the mechanism is further improved by-the interposition between the. driving shaft and igs. 2 and 4;,the pinion is pro-1' I notched at two pointsso as to engage ribs 12 on the pinion to prevent relative rotation of the pinion and disk. A cooperating disk 13 is secured to the end of the shaft by a screw 14 and caused to rotate with the shaft movement of the pinion and the shaft toL or to remain fixed therewith bya pin, 15. Compression springs 16 located in sockets in the pinion maintain the. disks --in frictional engagement, so that they tend to check relative movement of thepinion and the shaft. This device tends to retard the relative such an extent as to prevent jar when the table is finally bi'ou ht to rest, either at the end of its forwar rotation or upon its return movement, and thus noise and wear upon the parts are diminished.

i so

. in against the other'end of the hub of the. pu ley and against the end of the sleeve,1 7'.

. A coiledsprin 23 tends constantly to.move

' by which the operation of the stop mechanism is primar ly controlled, is pivotally spring-actuated mechanism The means for connecting anddisconnecting the pulley 3 and the. shaft 2 and for stopping the rotation of the shaft when so disconnected, are similar in general to those shown in the application above referred to. The pulley is loosely mounted upon a sleeve 1.7, which in turn is loosely mounted upo'n vthe hub 18 of a wheel or disk 19 secured to the shaft. The pulley and the wheel 19 are provided with .conical clutch members- 20 tlie' block-22' a on theshaft so as topush the rlley'to the eft and bring the clutch members on the pulley and the wheel 19 into engagement.

In order to disengage-the clutchmembers and stop the rotation of the driving shaft, is provided which is held out of operation by means of a latch and is thrown into operation by a trip actuated from the table 1. -Mounted in a recess inthe hub of the wheel 19 are two disks 24 and 25, both free to move longitudinally on-the shaft. The disk 24 is provided with two pins 26 whichpass through holes in the wheel 19 and engage the flange 21 on the sleeve 17. The operating lever 27 mounted upon a bushing 29 forming a hearing for therdriving shaft and mounted in the portion 30 of the frame of the machine, in which the stop mechanism is mounted. In the hub of the operatin lever two pins 31 are loosel'y'mounted atiametricallylopposite sides of the driving shaft. These pins hear at one end against cam surfaces on a collar 32 clampedupon the bushing 29,

and at. their. other ends they bear against the disk 25. .This arrangement is such that a movement of the operating lever in one direction forces the pins against the disk 25 'tion with the sto and moves the disks 24 and 25 in a direction to actuate the sleeve 17 to disconnect the clutch members on the pulley and the wheel 19 so as to stop the'rotation of the shaft while a return movement of the-lever allows the spring 23 to move the sleeve back and again connect the clutch members.

The wheel 19 is provided with a braking member 33 with which two brake shoes 34 are arranged to cotiperate to arrest the rotation of the driving shaft when the clutch members are disengaged. The brake shoes are secured to arms 35 pivotally mounted at '36 on opposite sides of the driving shaft and are connected by links 37 with the hub of the operating lever, the arrangement being such that the brake shoes are brought into .contact with, the braking member 33 when the operating lever ismoved in a direction to disengage the clutch member's. Such movement of the operating lever is caused by a spring 38 connected by means of a link '39 with the rear end of the operating lever. The lever is held during the operation of the machine in the position to which it is moved to permit the clutch members to engage and to hold the brake shoes out of contact with the braking member by means of a latch 40 pivotally mounted upon the lever and en- ;gaging a. fixed stop 41. To release the lever the latch 40 is actuated by means of a trip 42 carried by the table 1, this trip being so located upon the table that as the-latter completes its rotation the trip engages the end of a lever 43 secured to a stem 44 journaled in the frame 10f the machine. An arm 45 projects laterally from the lower end of the stem 44 and contacts with the latch 40 when the lever 43 is actuated by the trip so as to disengage thelatch from the stop 41. \Vhen the latch is so "disengaged, the spring 38 moves the operating lever so as to disconnect the clutch members and apply the brake:

A cylinder 46 is mounted upon the frame member 30 and is provided w1th a piston 47 connected by means of a pitman 48 with the rear end of the operating lever. The lower end of the cylinder 46 is provided with a vent 49 adjustable by means of a screw plunger 50. This device constitutes a pneumatic cheek. When the latch 40 is released and the spring 38 operates to draw the end of the operating lever down, the air-check operates to retard such movement, the extent of such retarding effect being gaged by the adjustment of the vent 49, and thus the movement of the operating lever in applying the brake shoes is gradual. I

Although of particular value in connecmechanism' of the type above described, t e present invention is applicable to stop mechanisms of other kinds, and the invention in general is not limited to the details of construction and operation of the illustrated embodiment, but may be embodied in other forms particularly defined in the claims.

Having now described the invention, what is claimed is:

1. A stop mechanism havin ,in combination, a shaft, means for actuatlng said shaft, means forconnecting and disconnecting said shaft and its actuating means and stopping said shaft, mechanism driven by saidxshaft, a spring connect-ion betwe the shaft and said mechanism arranged to .allow' an independent forward movement of. the mechanism and to impart a return movement thereto after said shaft is stopped, and means for retardin saidindependent forward movement, su stantially as described.

2. A sto mechanism having, in combination, a sha means for actuating said shaft, means for connecting an'd disconnecting said shaft and its actuating means and stopping said shaft, mechanism driven by said shaft, a spring connection between the shaft and said mechanism arranged to allow an independent forward movement of the mechanism and to impart a return movementthereto after said shaft is stopped, and means for retarding said return movement, substantially as described.

3. A stop mechanism having, in combination, a shaft, a gear driven b means for imparting a positive forward movement to the gear from the shaft, av

the shaft,-

4. A stop mechanism having, in combination, a shaft, ajgear driven by the shaft, means for imparting a positive forward movement to the gear from the shaft, a spring connection between the shaft and the gear arranged to allow an independent forranged to allow an independent forward movement of said mechanism and to impart a return movement thereto after said shaft is'stopped, and a retarding device for checking such return movement, substantially as described,

6. A stop mechanism having, in combination, a shaft, a gear driven by the shaft,

means for imparting a positive forward movement to the gear from the shaft, a

spring connection between the shaftand the gear arranged to allow an independent forward movement of the gear and to impart a return movement thereto, and two springpressed friction members rotating respectively with the shaft and the gear and o crating to check relative rotation of t e shaft and gear, substantially as described.

Intestimony whereof I aflix my signature, in presence 0. two witnesses.

' FREDERICK J. NASH. W'itnesses:

Loms H. BAKER, FRED O. FISH. 

